ntp: Remove unused tick_nsec

tick_nsec is only updated in the NTP core, but there are no users.

Remove it.

Signed-off-by: Thomas Gleixner <[e-mail]>
Signed-off-by: Anna-Maria Behnsen <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Acked-by: John Stultz <[e-mail]>
Link: https://lore.kernel.org/all/[e-mail]

arch/x86/include/asm/timer.h

···
 #include <linux/interrupt.h>
 #include <linux/math64.h>
 
-#define TICK_SIZE (tick_nsec / 1000)
-
 unsigned long long native_sched_clock(void);
 extern void recalibrate_cpu_khz(void);
 

include/linux/timex.h

···
  * estimated error = NTP dispersion.
  */
 extern unsigned long tick_usec;		/* USER_HZ period (usec) */
-extern unsigned long tick_nsec;		/* SHIFTED_HZ period (nsec) */
 
 /* Required to safely shift negative values */
 #define shift_right(x, s) ({	\

kernel/time/ntp.c

···
 /* USER_HZ period (usecs): */
 unsigned long			tick_usec = USER_TICK_USEC;
 
-/* SHIFTED_HZ period (nsecs): */
-unsigned long			tick_nsec;
-
 static u64			tick_length;
 static u64			tick_length_base;
 
···
  */
 
 /*
- * Update (tick_length, tick_length_base, tick_nsec), based
- * on (tick_usec, ntp_tick_adj, time_freq):
+ * Update tick_length and tick_length_base, based on tick_usec, ntp_tick_adj and
+ * time_freq:
  */
 static void ntp_update_frequency(void)
 {
···
 	second_length		+= ntp_tick_adj;
 	second_length		+= time_freq;
 
-	tick_nsec		 = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
 	new_base		 = div_u64(second_length, NTP_INTERVAL_FREQ);
 
 	/*